/Engine/Source/Editor/Kismet/Public/BlueprintCompilationManager.h
Registers a blueprint compiler extension - anytime a blueprint of the provided type is compiled the extension will be activated. Note that because editor initialization may require blueprint compilation there may be blueprints compiled before the extension is registed unless special care has been taken.
static void RegisterCompilerExtension ( [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [UBlueprint](API\Runtime\Engine\Engine\UBlueprint) > BlueprintType, [UBlueprintCompilerExtension](API\Editor\Kismet\UBlueprintCompilerExtension) * Extension )